As you may have noticed, your MagicBands came with a DVC Slider. I know, you are wondering what will this get you?
Absolutely nothing. It is simply bling that you can add to your MagicBand to show others in the park that you are “important”, or at least you think you are.
Here are some other bling things for your MagicBand:
http://www.disneystore.com/magicband/mn/1024701/
Most of these are also available in the parks, hotels and of course Downtown Disney (soon to be Disney Springs)